DMRG study of (1/2,1) Heisenberg ladders finds 1/3 magnetization plateau for J_perp>0 (limited range for J_perp<0) and locates the KT critical point via finite-size transverse spin correlations.
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Mixed-spin Heisenberg ladders in a magnetic field
DMRG study of (1/2,1) Heisenberg ladders finds 1/3 magnetization plateau for J_perp>0 (limited range for J_perp<0) and locates the KT critical point via finite-size transverse spin correlations.